You are upgrading to the Oracle 10g Database and will use the Automatic Shared Memory Management feature of the Oracle 10g Database. Which background process serves as the SGA memory broker that 
coordinates the sizing of the memory components？（）  

You set the value of the SGA_TARGET initialization parameter to 1G to enable Oracle to automatically resize most of the memory components according to the current workload in the database. You issue the following statement：  
SQL> SELECT name， value， isdefault  2 FROM v$parameter  
3 WHERE name LIKE ’%size%’；  
The output of this statement displays that the DB_CACHE_SIZE， SHARED_POOL_SIZE， 
LARGE_POOL_SIZE， and JAVA_POOL_SIZE initialization parameters contain a zero value.  What does this imply？（）

Your SPFILE contains the following parameter settings：  
SGA_TARGET = 8G  
DB_CACHE_SIZE = 4G  
SHARED_POOL_SIZE = 2G  
LARGE_POOL_SIZE = 512M  
JAVA_POOL_SIZE = 512M  
LOG_BUFFER = 100M  
SGA_MAX_SIZE = 10G  
You query the V$SGA_DYNAMIC_COMPONENTS dynamic performance view and discover that the large pool component is currently sized at 1G. You want the value of the SGA_TARGET initialization parameter to 10G， but instead of specifying a value of 10G for the SGA_TARGET initialization parameter， you erroneously execute the following statement：  
SQL>ALTER SYSTEM SET SGA_TARGET = 0 SCOPE = BOTH；  
What is the result of this statement？（）  

You create an Oracle 10g database and configure the SPFILE as follows：  
SGA_TARGET=2G  
DB_CACHE_SIZE=512M  LOG_BUFFER=50M  
DB_KEEP_CACHE_SIZE=128M  
You modify the SGA_TARGET initialization parameter using the following statement：  
SQL>ALTER SYSTEM SET SGA_TARGET = 1G SCOPE = BOTH；  
Which entity does this statement affect？（）